Raser Technologies calls its revamped Hummer a "Prius-Stomping Green Machine," based on an E-REV powertrain that supposedly enables large vehicles to drive the first 40 miles in all-electric mode. The company calculates that a typical driver who goes 65 miles per day would average about 100 mpg, and that driving over 200 miles per day would still get about double the fuel economy of a regular Hummer.